Research On Cathode Life Evalution Of Electron Gun

The metal cathode is one of the core components of the electron gun.The cathode serves as the emission source of the electron gun and can provide continuous electron beam energy to the electron gun under the action of the acceleration power system.The life of the cathode of the electron gun is directly related to the emission performance of the electron gun,which will affect the surface quality of the workpiece.How to keep the electron gun work efficiently and stably during the process of the electron gun and ensure the quality level of the product is a hot issue of research.Therefore,full and accurate reliability research and life prediction evaluation of the cathode life of the electron gun can not only provide an important theoretical reference for the maintenance decision of the electron gun,but also ensure the continuous efficient and stable operation of the cathode of the electron gun and ensure that the quality of the workpiece meets the process requirements.The subject cuts in from this angle,and the research on the service life of the cathode of the electron gun has certain theoretical significance and practical value in both the maintenance decision of the electron gun and the promotion of metal powder additive manufacturing.The thesis takes the electron gun of the internship company as the research object,mainly studies the factors that affect the life of the electron gun cathode,and proposes a method for reliability assessment and life prediction assessment method.Through the comparison of simulation results and measured data,the method is determined for the electron gun cathode The feasibility of life assessment laid the foundation for the realization of automatic printing of metal powder bed equipment in the future.Firstly,it summarizes the research status of electron gun cathode and metal powder additive manufacturing technology at home and abroad;secondly,it analyzes the emission mechanism of the electron gun cathode,and obtains the change trend of operating parameters and electron gun cathode filament life by using experimental equipment and obtains some parameters.The amount of performance degradation;then for the nonlinear characteristics of the degradation trajectory of the cathode of the electron gun,a wiener process with nonlinear drift parameters is proposed to construct a deductive model of the degradation rules of the key components of the electron gun,and finally use Bayesian inference and expectation maximization algorithm A method of performing decoupling calculations to obtain prediction results.And use the simulation software to obtain the degradation data to update the degradation model,derive the time when the degradation process reaches its failure threshold,verify the feasibility of the remaining life prediction method of the nonlinear degradation model,and finally realize the life prediction of the electron gun cathode life.Finally,it is concluded that the proposed nonlinear degradation process evaluation method is effective for life evaluation of the electron gun cathode,and realizes the real-time update of the electron gun cathode parameters and life evaluation results.This method can provide maintenance decisions for the electron gun cathode filament Theoretical basis.